Process for obtaining a textured glass substrate coated with an antireflective coating of sol-gel type

Patent metadata

Field	Value
Publication number	US-11465934-B2
Application number	US-201816629149-A
Country	US
Kind code	B2
Filing date	Jul 5, 2018
Priority date	Jul 7, 2017
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A process for obtaining a material including a textured glass substrate coated, on at least one of its textured faces, with an antireflective coating of sol-gel type based on porous silica, includes a stage of application, to the at least one textured face of the substrate, of a solution containing at least one silica precursor and at least one pore-forming agent, then a heat treatment stage targeted at consolidating the antireflective coating. Before the application stage, the glass substrate is subjected to a preheating stage, so that the at least one textured face intended to be coated with the antireflective coating has a temperature within a range extending from 30° C. to 100° C. immediately before the application stage.

First claim

The invention claimed is:

1. A process for obtaining a material comprising a textured glass substrate coated, on at least one of its textured faces, with an antireflective coating of sol-gel type based on porous silica, said process comprising:
applying, to said at least one textured face of said substrate, a solution containing at least one silica precursor and at least one solid pore-forming agent, said at least one solid pore-forming agent being in form of hollow or solid beads in said solution, then
performing a heat treatment for consolidating said antireflective coating,
said process further comprising, before said applying, subjecting the glass substrate to a preheating stage, so that said at least one textured face intended to be coated with said antireflective coating has a temperature within a range extending from 30° C. to 100° C. immediately before said applying.

2. The process as claimed in claim 1 , wherein the solution is aqueous.

3. The process as claimed in claim 1 , wherein a light transmittance factor within the meaning of Standard EN 410 of the glass substrate is at least 90%.

4. The process as claimed in claim 3 , wherein the light transmittance factor within the meaning of Standard EN 410 of the glass substrate is at least 91%.

5. The process as claimed in claim 1 , wherein the solution is applied by coating by means of at least one roll.

6. The process as claimed in claim 1 , wherein the silica precursor is a compound chosen from silicon alkoxides and halides.

7. The process as claimed in claim 1 , wherein the at least one pore-forming agent is an organic agent.

8. The process as claimed in claim 7 , wherein the at least one pore-forming agent comprises polymeric beads made of polymethyl methacrylate, methyl (meth)acrylate/(meth)acrylic acid copolymers, polycarbonates, polyesters or polystyrene.

9. The process as claimed in claim 1 , wherein the preheating stage is carried out by radiation or by convection.

10. The process as claimed in claim 9 , wherein preheating stage is carried out by means of infrared lamps or by blowing of hot air.

11. The process as claimed in claim 1 , wherein the heat treatment is a tempering treatment of the glass.

12. The process as claimed in claim 1 , further comprising, immediately after the applying and before the heat treatment, a drying stage.

13. The process as claimed in claim 1 , wherein the antireflective coating exhibits a mean thickness within a range extending from 10 nm to 10 μm.

14. The process as claimed in claim 13 , wherein the antireflective coating exhibits a mean thickness within a range extending from 20 nm to 1 μm.

15. The process as claimed in claim 1 , wherein the temperature is within a range extending from 50° C. to 80° C.

16. The process as claimed in claim 1 , wherein the glass substrate exhibits a haze of at least 20%.

17. The process as claimed in claim 1 , wherein at least one textured face of the glass substrate intended to be coated with the antireflective coating exhibits a profile such that, within the meaning of Standard ISO 4287:1997:
the parameter Rz is within a range extending from 18 to 200 μm, and
the parameter RSm is within a range extending from 500 to 2500 μm.

18. A process for obtaining a material comprising a textured glass substrate coated, on at least one of its textured faces, with an antireflective coating of sol-gel type based on porous silica, said process comprising:
applying, to said at least one textured face of said substrate, a solution containing at least one silica precursor and at least one pore-forming agent, then
performing a heat treatment for consolidating said antireflective coating,
said process further comprising, before said applying, subjecting the glass substrate to a preheating stage, so that said at least one textured face intended to be coated with said antireflective coating has a temperature within a range extending from 30° C. to 100° C. immediately before said applying, wherein at least one textured face of the glass substrate intended to be coated with the antireflective coating exhibits a profile such that, within the meaning of Standard ISO 4287:1997:
the parameter Rz is within a range extending from 18 to 200 μm, and
the parameter RSm is within a range extending from 500 to 2500 μm.

19. A process for obtaining a material comprising a textured glass substrate coated, on at least one of its textured faces, with an antireflective coating of sol-gel type based on porous silica, said process comprising:
applying, to said at least one textured face of said substrate, a solution containing at least one silica precursor and at least one pore-forming agent, then
performing a heat treatment for consolidating said antireflective coating,
said process further comprising, before said applying, subjecting the glass substrate to a preheating stage, so that said at least one textured face intended to be coated with said antireflective coating has a temperature within a range extending from 30° C. to 100° C. immediately before said applying, wherein the glass substrate exhibits a haze of at least 20%.

20. The process as claimed in claim 19 , wherein the glass substrate exhibits a haze of at least 50%.

Assignees

• Saint Gobain

Inventors

• Lequippe Guillaume
• Pardal Xiaolin
• Haller Servane

Classifications

• C03C2218/113

  by sol-gel processes · CPC title

• C03C2214/12

  Polymers · CPC title

• C03C17/25 Primary

  by deposition from the liquid phase · CPC title

• C03C17/007 Primary

  containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase · CPC title

• G02B1/113

  using inorganic layer materials only · CPC title